US3566745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic firearm bipartite semirigid bolt
Assignee: Heckler und Koch GmbH
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Filing: 1968-10-25
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Granted: 1971-03-02
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Expires: 1988-10-25
Abstract
Abstract An automatic firearm, in particular a hand firearm or small arm, with a semirigid bolt having a bolt head carrier provided with a camming piece and a bolt head disposed on the camming piece so as to be movable within certain limits in the longitudinal direction of the bolt. At two diametrically opposed points of the bolt, recesses are provided for accommodating locking members in the form of locking rollers which can be pushed outward by the camming piece to a point where they are free to leave the recesses of the bolt head in an outward direction and to enter into corresponding recesses in the barrel extension of the firearm.
Inventors
- 👤 Stanly Jauch
- 👤 Herbert Meidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:59
CPC Classifications
F; F41; F41A; F41A3/00; F41A3/12; F41A3/36; F41A3/44; F41A3/46
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
206 words
An automatic firearm with a semirigid bolt consisting of a bolt head carrier proVided with a camming piece and a bolt head which is so disposed as to be movable, within certain limits, with respect to said camming piece in the longitudinal direction of the bolt and which, at two diametrically opposed points, is provided with recessed, locking members being accommodated in said recesses, which locking members can be forced outward by the camming piece to a point where they can leave the recesses of the bolt head in an outward direction and enter into corresponding recesses in a barrel extension of the firearm, characterized in that a catch lever extending in the longitudinal direction of the bolt is pivotably supported in one of two component parts of the bolt consisting of a bolt head and bolt head carrier, a nose of said catch lever engaging the rear end of a shoulder on the other component part of the bolt with the bolt in the unlocked position, thus keeping the two component parts of the bolt apart, and a control cam is provided which is permanently connected to a slide and disengages said catch lever from said shoulder when the bolt moves into the locking position.
Claim 2
Dependent Claim
206 words
An automatic firearm with a semirigid bolt consisting of a bolt head carrier proVided with a camming piece and a bolt head which is so disposed as to be movable, within certain limits, with respect to said camming piece in the longitudinal direction of the bolt and which, at two diametrically opposed points, is provided with recessed, locking members being accommodated in said recesses, which locking members can be forced outward by the camming piece to a point where they can leave the recesses of the bolt head in an outward direction and enter into corresponding recesses in a barrel extension of the firearm, characterized in that a catch lever extending in the longitudinal direction of the bolt is pivotably supported in one of two component parts of the bolt consisting of a bolt head and bolt head carrier, a nose of said catch lever engaging the rear end of a shoulder on the other component part of the bolt with the bolt in the unlocked position, thus keeping the two component parts of the bolt apart, and a control cam is provided which is permanently connected to a slide and disengages said catch lever from said shoulder when the bolt moves into the locking position.
Claim 3
Dependent Claim
40 words
A firearm according to claim 1, characterized in that said control cam which is permanently connected to the slide is provided with an indentation engaged by a projection of said catch lever when the bolt is in the locked position.
Claim 4
Dependent Claim
51 words
A firearm according to claim 1, characterized in that one end of said catch lever is provided with a projection which is engaged by a recess of the other component part of the bolt and which bottoms against one end of said recess when the bolt is in the unlocked position.
Claim 5
Dependent Claim
41 words
A firearm according to claim 1, characterized in that said catch lever is loaded by a spring which tends to keep said nose and a projection provided on said catch lever in engagement with said other component part of the bolt.
Claim 6
Dependent Claim
19 words
A firearm according to claim 1, characterized in that said catch lever is supported in said bolt head carrier.
Claim 7
Dependent Claim
58 words
A firearm according to claim 5, characterized in that said catch lever, near its forward end, is provided with a sawtooth-shaped nose, the steep flank of which engages the rear end face of said bolt head with the bolt in the unlocked position and drops into a corresponding recess of said bolt head when the bolt is locked.
Claim 8
Dependent Claim
64 words
A firearm according to claim 5, characterized in that said catch lever, near its forward end and laterally of said nose, is provided with a cam extending in the same direction, said cam cooperating with a ramp disposed in the barrel extension of the firearm, said ramp being followed by an indentation into which said cam drops in the locking position of the bolt.
Claim 9
Dependent Claim
45 words
A firearm according to claim 1, characterized in that a spring-loaded pin, which tends to push the two component parts of the bolt apart, is supported in one of the two component parts so that it can move in the longitudinal direction of the bolt.
Claim 10
Dependent Claim
18 words
A firearm according to claim 8, characterized in that said pin is supported in the bolt head carrier.
Claim 11
Dependent Claim
21 words
A firearm according to claim 1, characterized in that said bolt head carrier is secured in the slide of a pistol.
Claim 12
Dependent Claim
17 words
A firearm according to claim 1, wherein said locking members are in the form of locking rollers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |